Showing 1–6 of 6 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Daisuke Haba | Kai R&D Center Co. | 2 |
| 2 | Tsukasa Tamaoki | Kai R&D Center Co. | 1 |
| 2 | Seiya Yamamoto | Feather Safety Razor Co. | 1 |
| 2 | Tsuyoshi Uno | — | 1 |
| 2 | Shouji Ueno | Feather Safety Razor Co. | 1 |
| 2 | Hidekazu Kito | Oci Company | 1 |